The
difference between the speaker and the receiver

The basic structure of
the speaker and the receiver is almost the same; the diaphragm generates
the sound by the reaction upon the sound coil and magnet.

The main diversities
are as below:The different usage
 Depend on the size of the speaker; the distance between the speaker
and the user’s ears is normally from several dozens of centimeters
to several meters. However we always nestle up a receiver against
our ears.

The different material of the diaphragm
and the sound coil
 In order to bear the higher power, the diaphragm of the speaker
is usually thicker than the receiver, the thinnest one is 18u. The
larger of the dimension and the power is the heavier the diaphragm
will be.
 The receiver takes the lower power, but requests for better low
frequency curve; therefore we usually use the diaphragm with the
thickness from 6u-12u.
 Besides the diaphragm, the receiver often works with a piece of
paper or cloth to adjust the frequency response, which can help
to meet all kinds of standards or to match up the resonant box of
the mechanism.

The different electronic characteristic
 We often see the speaker with impedance of 4-8ohm, the too high
impedance leads to the higher power to drive the speaker, normally
is from 0.2W to several dozens of watt.
 Depend on the circuit design, the impedance of the receiver is
from 16, 32 to 150ohm. The general power is only from 0.01W to 0.1W.